The number of regions inside a pentagon formed by the straight line segments mutually connecting all vertices and all points that divide the sides into n equal parts.

A331929

The number of regions inside a pentagon formed by the straight line segments mutually connecting all vertices and all points that divide the sides into n equal parts.

Terms

    a(0) =11a(1) =170a(2) =1161a(3) =3900a(4) =10741a(5) =22380a(6) =44491a(7) =76610a(8) =126336a(9) =194070a(10) =290651a(11) =410860a(12) =577721a(13) =779340a(14) =1035676a(15) =1345030a(16) =1730696a(17) =2176040a(18) =2724036a(19) =3345880a(20) =4087656a(21) =4933200a(22) =5921991a(23) =7018210a(24) =8300896a(25) =9723300a(26) =11339151a(27) =13122120a(28) =15150271a(29) =17345140

External references